The boat’s upstream speed is 10 km/h and it’s speed in still water is 17 km/h. What would be the stream rate?

The boat’s upstream speed is 10 km/h and it’s speed in still water is 17 km/h. What would be the stream rate?
1). 5 km/h
2). 7 km/h
3). 10 km/h
4). 14 km/h

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